Electric motor-driven tool



Nov. 11, 1947- c. JACKSON ELECTRIC MOTQR DRIVEN TOOL Filed Dec. 5, 1945 INVENTOR.

C/dC/f50/7 Patented Nov. 11, 1947 UNITED STATES PATENT OFFICE ELECTRIC 'MOTOR- DRIVEN TOOL Corwill Jackson, Ludington, Mich.

Application December 5, 1945, Serial No. 632,865

9 Claims.-

This invention relates to improvements in electric motor driven tool.

The main objects of this invention are:

First,- to-prvide an implement ofpthe submersible type for treating concrete and like materials which is very convenient to handle or ma nipulate with a-minimum of efiort onthe part of thc operator;

Second; to provide animplement of th is-character which-may be pulled along on the ground oron a surfacewithout injury thereto.

Third, to provide-an implement ofthis -character in which the motor assemblyis-wellbal anced relativeto thehand-les orgrips.

Obiectsrelatingto details and economies ofthe invention will appear from the -description to-fo1- low. The invention is defined-and pointed out in the claims.

A structure: which embodies the features of the invention is illustrated in the accompanying drawing, in which:

Fig. 1 is a sideele-vaticn of-animplement embodying. my invention, the-electrical circuit cord being partially broken away and the tool bein-g partially broken awayin section.

Fig. 2 is an'enlarged planyiew'with the" tool and its shait removed.

Fig. 31s afragmentary view partially in longitudinal section on line- 33 of Fig. 2.

Fig. 4 is a rear end elevation of the-structure's shown in Figs. 2 and 3..

Fig. 5 is an enlarged transverse section on line Fig. 6 is al'ongitudinal section ofa modified form of supporting base;

Fig. "I illustrates-the tool. provided with afiexible shaft of considerable; length, which may: be substituted for the relatively short shaft. shown in Fig. 1.

In the embodiment of my invention illustrated, the electric motor designated generally by the numeral I is provided with; a: cylindrical casing 2 having integral longitudinally spaced-lugs 3+4 on the under: side thereof and similar longitudi nally spaced lugs i -4 'onthe upper side: thereof.

The motor is provided with a controlsswitchg 5. at- -its front end and the. electrical cirouitron nections'li.

I 'providea base for the motor designated-gem erally by the. numeral 1 and comprising side mombers 8-.-8 connected at their-rear ends" byv the rear cross member 9, the side members; andcross members being formed integrally 011a piece-c o1 tubing. The front cross piece I0 is disposed with its ends in abutting relation: to the near side-of the side members 8 and in spaced relation to their front ends and is welded thereto.

The front ends I l of the side members are bent upwardly and convergingly and terminate in flattened ears I2 to which the handle or grip I3 is secured, the handle extending transversely in approximately the central horizontal plane of the motor and'constituting a guard for the switch 5. The handle is desirably located so that the switch or control member 5 may be manipulated by the fingers of a hand grasping the handle l3.

A second handle or grip I4 is disposedlongitudinally and centrally of the motor, beingsupported by brackets I5 secured to the lugs 4.

The motor is secured to theplatform IB' which is a fiat plate welded at its ends to the upper side of the rear cross member 9 and the cross piece It, the lugs 3 being secured to the platform by means of screws ll.

With the parts thus arranged an efiective base is provided on which the motor may rest in'upright position, the base extending well beyond the motor laterally so that there is little likelihood of the motor tipping over even when the structure is dragged or pulled over quite uneven surfaces. The structure is also relatively lightin. weight which is of particular advantage when the drive shaft for the implement I8 is comparatively short so that the tool may be manipulated from the implement graspedand supported by the operator.

The tool l8 comprises an elongated submersible casing having a rotor l9 mounted therein, the rotor being provided with an unbalancing weight Zlfso that the tool is vibrated at high frequency when driven through the shaft designated generally by the numeral 2!, this shaft being a flexible shaft provided with a casing of such rigidity as to permit the manipulation of the tool by an operator graspingcthe grips or handles.

I have not illustrated the details of the flexible shaft'andits casing, as suitable shafting of this character is known in the industry.

However, the shafting 2| is connected by the coupling 22 to the rear end of the casing which is provided with a threaded stud 23 to receive the same, the outer end of the shaft Casing being connected to the socket 24 of the tool.

In Fig. 7 the shaft 25 is of considerable length and when a long'shaft is used, the motor rests upon its base.

In the modificationshown in Fig. 6, the side members ZGofthe; base have upturned rear ends 21 of the rear: cross member 28 correspcndingto the; cross-member 9 being elevated. This pro-- 3 vides a runner or shoe-like structure at both ends of the base,

A second cross piece 29 is provided to support the platform It.

The implement of my invention is very eflicient and may be manipulated with relatively little effort on the part of the operator as the base or supporting parts for the motor also provide for the location of one of the handles at a convenient position, the second handle being arranged so that the tool may be conveniently manipulated to meet the many varying conditions presented in use.

I have illustrated and described my invention in a commercial embodiment thereof. I have not attempted to illustrate or describe certain other modifications and adaptations Which I contemplate, as it is believed that this disclosure will enable those skilled in the art to embody or adapt my invention as may be desired.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A support for an implement of the class described having an electric motor provided with a casing having longitudinally spaced lugs on the upper and lower sides thereof and provided with a control switch at its front end, comprising a rectangular base having side members, a rear cross member integral with the side members and a front cross piece extending between and Welded to the inner sides of the side members in rearwardly spaced relation to their front ends, a platform welded to the upper sides of said rear cross member and cross piece, the bottom lugs of said motor casing being secured to said platform, the front ends of the side members beyond said front cross piece being turned upwardly and convergingly, a grip connecting the upturned forward ends of said side members disposed trans-- versely across the longitudinal aXis of said casing and constituting a guard for the switch, the switch being operable with the hand of the operator grasping the grip, and a second grip disposed longitudinally and centrally of the casing and secured to said lugs on the top thereof.

2, A support for an implement of the class described having an electric motor provided with a casing having longitudinally spaced lugs on the upper and lower sides thereof, a base having side members, a rear cross member integral with the side members and a front cross piece extending between and welded to the inner sides of the side members in rearwardly spaced relation to their front ends, a platform welded to the upper sides of said rear cross member and cross piece, the bottom lugs of said motor casing being secured to said platform, the front ends of the side members beyond said front cross piece being turned upwardly and convergingly, a grip connecting the upturned forward ends of the said side members disposed transversely of said casing, and a second grip disposed longitudinally and centrally of the casing and secured to said lugs on the top thereof.

3. A support for an implement of the class described having an electric motor provided with a control switch at its front end, a base having side members, a rear cross member integral with the side members and a front cross piece Welded to the side members in rearwardly spaced relation to their front ends, a platform welded to the upper sides of said rear cross member and said cross piece, the motor being secured to the platform with the axis of its rotor disposed longitudinally of the base, the front ends of the side members beyond the said front cross piece being turned upwardly and converging at the front of the motor and connected to provide a handle, the handle constituting a guard for the switch and extending transversely across the axis of the rotor, the switch being operable with the hand of the operator grasping the handle, and a second handle disposed longitudinally and centrally at the top of the motor.

4. A support for an implement of the class described having a motor, a base having side members, a rear cross member integral with the side members and a front cross piece welded to the side members in rearwardly spaced relation to their front ends, a platform Welded to the upper sides of said rear cross member and said cross piece, the motor being secured to the platform with the axis of its rotor disposed longitudinally of the base, the base side members having a transversely disposed handle at their front ends, and a second handle disposed longitudinally and centrally at the top of the motor.

5. A support for an implement of the class described having a motor, a base having side members, a rear cross member integral with the side members and a front cross piece Welded to the side members in rearwardly spaced relation to their front ends, a platform welded to the upper sides of said rea cross member and said cross piece, the motor being secured to the platform with the aXis of its rotor disposed longitudinally of the base, the base side members having a transversely disposed handle at their front ends and intersecting the axis of the motor, and a second handle disposed longitudinally and centrally at the top of the motor.

6. A support for an implement of the class described having a motor provided with a casing and having a control member at its front end, a base having side members and longitudinally spaced cross pieces fixedly connected to the side members, the side members projecting upwardly at the front of the motor and in spaced relation thereto and carrying a handle disposed transversely of the motor casing in guarding relation to said control member, said motor casing being fixedly secured to said base, and a second handle disposed longitudinally and centrally above the motor casing.

7. A support for an implement of the class described having a motor, a base having side members and longitudinally spaced cross pieces fixedly connected to the side members, the side members projecting upwardly at the front of the motor and in spaced relation thereto and carrying a handle disposed transversely of the motor casing, said motor casing being fixedly secured to said base, and a second handle disposed longitudinally and centrally above the motor casing.

8. A support for an implement of the class described having a motor provided with a casing and having a control member at its front end, a base having side members and longitudinally spaced cross pieces fixedly connected to the side members, the side members projecting upwardly at the front of the motor and in spaced relation thereto and carrying a handle disposed transversely of the motor casing in guarding relation to said control member, said motor casing being fixedly secured to said base, and a second handle disposed longitudinally and centrally above the motor casing.

9. A support for an implement of the class described having a motor, a base having side members and longitudinally spaced cross pieces fixedly connected to the side members, the side members UNITED STATES PATENTS carrying a handle disposed transversely of the Number e Date motor, said motor casing being fixedly secured to 3, 65 Mall Feb. 28, 1939 said base, and a second handle disposed longi- ,9 Jackson Jan. 13, 1942 tudinally and centrally above the motor casing. 2, 48,612 Deacon May 9, 1944 CORWILL JACKSON.

REFERENCES CITED The following references are of record in the 10 file of this patent: 

